Metal-melting furnace.



D. S. MAHFIELD. METAL MELTING FURNACE. APPLICATION msn 1AN.2, 1911.'

LQQQAM.. Patented June 12, 1917.

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llNfrflFD- TATF@ PATENT DWIGHT S. MARFIELD, OF CINCINNATI, OHIO, lASSIGrNOR TO THE BUCKEYE PRODUCTS COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OI-IIO.

METALeMEIiTINGr FURNACE.

Specification of Letters Patent.

Patented June 12, 1917.

Application led January 2, 1917. Serial No. 140,224.

To all whom t may concern:

a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Metal-Melting Furnaces, of which the following is a specification. 'v

My invention relates to improvements in furnaces for melting metal to be cast,

One of its objects is to provide an improved form of rotatably mounted furnace with improved features of assembly. An-r other object is to provide an improved form of furnace adapted to attain reverberatory effects, and to conserve the heat, and to enable liquid or gaseous fuels 'to be employed to advantage.

Another object is to provide -improved means to facilitate skimming and pouring of the metal. My invention also comprises certain details of form,` combination and ar rangement, all of which will be fully set forth in the description of the accompanying drawings, in which:

Figure 1, is a central longitudinal section through a furnace embodying my improvements. v y p y Fig. 2, is a vertical section through the same on line .r of Fig. l.

Fig. 3, is a view similar to Fig. 2, illustrating the furnace in position for'skimming and pouring. A

Fig. 4, is a horizontal longitudinal section through a furnace illustrating a modification.

The accompanying drawings illustrate the preferred embodiments of my invention, in Figs. 1 to 3 of which A represents aA cylindrical furnace rotatably mounted upon its longitudinal axis. The'body of the furnace preferably comprises a cylindrical shell of sheet metal 2, in the interior of which is molded a cylindrical lining 3 of heat and chemical resisting material. rlhe forward end is closed by a metal head 4 having a tubular trunnion 5, said head having molded upon its inner face a disk shaped section of lining material 6 to make close joints with the forward end of the lining section 3 when the head 4 is assembled with and detachably bolted to the cylindrical section 2. The lining section 6 has a central perforation to register with the bore of the trunnion 5.

The opposite end of the cylinder is closed by means of a metal head 7 having a solid trunnion 8 and a disk shaped lining section 9 to register with the opposite end of the cylindrical lining section 8. rlhe head-7 is retained in position by means of bolts which detachably secure it to the cylindrical section 2. y

The trunnions 5 and 8 `are rotatably supported in bearings at the .upper ends of standards 10 and 11.V A worm wheel f is mounted upon the trunnion 8 outside of the standard 11 and is engaged by a worm on shaft 12, journaled to standard 11. The shaft 12 also carries a beveled gear wheel 14 which meshes with a beveled gear 15 on the shaft 16 journaled to standard 11, and rotated by hand by means of hand wheel 17 to rotate the furnace to any desired position.

An air-blast pipe 1S having a controlling damper or gate 19 is loosely connected by means of a telescopic joint 36 and flange joint 37 to the bore of trunnion 5 to discharge a blast of cool or heated air into the furnace to support combustion therein.

A fuel supply pipe 20 to supply liquid, gaseous or pulverulent fuel to the furnace is controlled by means of a cock 21 and enters the bore of trunnion 5 through the wall of the air blast pipe so as to terminate concentrically therewith in the bore of trunnion 5, so as to enable the incoming fuel and air to thoroughly mix as they enter the furnace chamber. Where liquid fuel is e1nployed the air-blast serves to atomize the liquid as it leaves the exit Iof pipe 20, and for which purpose any desired atomizing apparatus not shown may be employed,

At one side of the furnace, preferably about midway thereof I `provide an opening 25 with an inwardly projecting rim or flange 26 in one edge of which is a recess 27 to serve as a lip when skimming or pouring the metal. As illustrated this flange and lip are detachably and renewably provided in the form of a thimble 28 conical or with a shoulder outside and with a cylindrical bore inside, seated in corresponding recess in the lining 3 and held in place by means of a metal flange 29 bolted to the casing 2.

The current of air and fuel in process of combustion sweeps substantially along the longitudinal axis of the interior of the furnace to the rear end thereof, where the gas- )ro'ectino rim instead 'of aermittino a Jreb b mature escape of said gases,rand hence in. sures` the gasesV remaining in the furnace chamber a suiiicient length of time to effect complete combustion and to part with the excess heat to the furnace walls before the gases are allowed to pass through the exit. The opening 25 serves as a metal chargingr orifice, a gas exit orifice, and for skimming and pouring the molten metal. rlhe shape ofthe furnace interior issuch as to reflect and concentrate the radiant heaty from all points upon the yfurnace charge.k The furnace ris readily detachable and renewable.

f In the modification F ig. t, the kbore 35 yin the trunnion 51 of head 11 'and lining 61 is conical, and the airconduit 1811 and fuel conduit 201 are inclined relative to the axis of rotation so that the current of incoming gases sweeps diagonallyT across the furnace chamber and is then deflected by the lining` V9 so as tol return along the opposite side wall and thence escape through the vexit 25. The inclination of the conduits 1811 and 201 may be in horizontal or other plane as desired to secure the` best practical results.

The mechanism herein illustrated and described is,r capable of considerable modification without departing from the principle of my invention.

Having described my invention, what I claim is :V v

1. A furnace having a melting chamber provided at one end with a burner opening and in a wall at substantially right angles thereto with a port for charging and pouring, saidfport having 'an annulus at its inner end projecting into said chamber and adapted to baflie Vthe combustible gases as *jecting into said melting chamber to they sweep along the. wall'of said chamber toward said port.

2. A furnace having a melting chamber and rotatably mounted upon substantially horizontal bearings, an inlet port for fuel and air through one of said bearings, a

Y charging and pouring port leading through fuel and air leading into said chamber along y the axis of rotation at one end thereof, and la charging and pouring port in thek side wall of the furnace having at its inner end an annulus projecting from the wall of said chamber inwardly, and a pouring lip Vin said lannulus serving to baffle the combustible gases as they sweep along the Wall of` said chamber toward said charging poort.

4.-. A furnace .comprising a cylindrical metal shell .having a cylindrical refractory lining, metal heads provided with refractory linings and detachably connected tol said cylindricalshell at opposite ends thereof to provide a refractory walled melting y chamber, trunnions carried by said heads toy rotatably support said furnace, an inlet port for fuel and air through one of said trun- V nions, andan annular thiinble detachably. lseated in a recess through the ycylindrical wall of said furnace with its inner end proform a charging and pouringport and an annulus to baffle the furnace gases as. they sweep along the wall of said chamber toward said charging port. l

DWIGHT S. MARFIELD.

Witnesses: n

C.. W. MILES, I 4 ELsrn HANsJnnGnN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. f 

